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add actual folly implementation of memcpy

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Brendan Hansknecht 2023-06-01 21:34:42 -07:00
parent 77624f627b
commit 0e2c3e4723
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4 changed files with 460 additions and 3 deletions
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7
crates/compiler/builtins/bitcode/src/libc.zig
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@ -2,6 +2,7 @@ const std = @import("std");
const builtin = @import("builtin");
const arch = builtin.cpu.arch;
const musl = @import("libc/musl.zig");
const folly = @import("libc/folly.zig");
const cpuid = @import("libc/cpuid.zig");
comptime {
@ -12,7 +13,7 @@ comptime {
const Memcpy = fn (noalias [*]u8, noalias [*]const u8, len: usize) callconv(.C) [*]u8;
pub var memcpy_target: Memcpy = switch (arch) {
// TODO(): Switch to dispatch_memcpy once the surgical linker can support it.
// TODO: Switch to dispatch_memcpy once the surgical linker can support it.
// .x86_64 => dispatch_memcpy,
.x86_64 => musl.memcpy,
else => unreachable,
@ -48,9 +49,9 @@ fn dispatch_memcpy(noalias dest: [*]u8, noalias src: [*]const u8, len: usize) ca
.x86_64 => {
if (cpuid.supports_avx2()) {
if (cpuid.supports_prefetchw()) {
memcpy_target = musl.memcpy;
memcpy_target = folly.memcpy_prefetchw;
} else {
memcpy_target = musl.memcpy;
memcpy_target = folly.memcpy_prefetcht0;
}
} else {
memcpy_target = musl.memcpy;